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A novel mechanism for red emission carbon dots: hydrogen bond dominated molecular states emission

Abstract

Carbon dots (CDs) emerge as novel fluorescent probes due to remarkable optical properties, however, the red emission is still rare, in relative low efficiency and ambiguous mechanism. Herein, relatively efficient red emission CDs based on p-phenylenediamine was prepared through various solvothermal way and the highest quantum yield approached to 41.1% in n-amyl alcohol, which was the most efficient one reported. Various structural characterizations were performed and confirmed the red emission originated from the molecular states consisted of nitrogen contained organic fluorophore. The CDs were dispersed into different organic solvents and showed tunable emission, evolving from green to orange-red in the aprotic solvents and red emission in the protic solvents. Further solvents correlation studies indicated that the hydrogen bond effect between CDs and solvents was the main mechanism leading to the spectral shift. Accordingly, solid states luminescent CDs-polymers were fabricated, which also demonstrated continuously tunable emission properties. This work opens a new window for recognizing the generation of tunable and red emission CDs.

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Publication details

The article was received on 19 May 2017, accepted on 09 Aug 2017 and first published on 10 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR03570E
Citation: Nanoscale, 2017, Accepted Manuscript
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    A novel mechanism for red emission carbon dots: hydrogen bond dominated molecular states emission

    T. Zhang, J. Zhu, Y. Zhai, H. Wang, X. Bai, B. Dong, H. Wang and H. Song, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03570E

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